Hello,
Processor Expert generated code is plain C code, and cannot be compiled in C++ mode.
Make sure you compile all Processor Expert files in C mode.
Additionally, this article might help: Processor Expert, gcc C++ and Kinetis-L with MQXLite | MCU on Eclipse
(although I see you are using S08, but the principles apply to the S08 as well).
It is much easier if you create a project with Processor Expert and C, and then add your C++ files to it (and compile them in C++ mode). The only thing you need to be careful is that you make sure you call your global constructors (or add that to the startup code). If you are not constructing global objects, then this is not necessary.
Hope this helps,
Erich